Hello Fred,
It is now 24/7 on for about 5 weeks.
5 weeks is nothing in the life of a reference.
During the first year my 2 LM399 references drifted 500uV against each other
The 2nd year it was only 220uV
now I know that LM399 #1 is drifting much more (200uV) than LM399 #2 (20uV)
in the 2nd year.
In the 3rd year LM399#1 drifted around 140uV and LM399#3 less than 10uV.
So not all references seem to be usable for precision measurement.
Its shurely no fault to start with a set of several references and select
out the bad ones.
With best regards
Andreas
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